Behavior of multi-layer permeable reactive barriers for groundwater remediation

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2023-11-20 DOI:10.1016/j.sandf.2023.101398

Stefania Bilardi, Silvia Simonetti, Paolo Salvatore Calabrò, Nicola Moraci

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引用次数: 0

Abstract

This paper aims to evaluate the efficiency of a multilayer configuration of a permeable reactive barrier (PRB) made up of granular mixtures of zero valent iron (ZVI) and lapillus. The latter is a volcanic material used to disperse ZVI particles. A high dispersion of ZVI improves the long-term hydraulic conductivity but can significantly reduce reactivity due to the lower amount of ZVI. In this research, the performance of two different combinations of a two-layer configuration was studied by means of long-term column tests. The first layer, named “pre-treatment layer”, had a thickness of 4 cm and a volumetric ratio (ZVI/lapillus) of 10:90 or 05:95, while the second layer had a volumetric ratio (ZVI/lapillus) of 20:80. A single layer configuration made only of the 20:80 ZVI/lapillus was used as a benchmark. The three tests were performed using a multi-contaminated solution of copper, nickel and zinc. Test results showed an early loss of the hydraulic conductivity in the single layer configuration and an increase of PRB longevity by 68 % in the presence of the pre-treatment layer. The pre-treatment zone containing 10 % ZVI delayed the clogging phenomenon, while the zone with 5 % ZVI ensured both the correct long-term hydraulic behavior and a removal efficiency higher than 77.6 % for Nickel and 99 % for copper and zinc at 23 cm of thickness for at least two months.

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多层渗透反应屏障对地下水修复的影响

本文旨在评价由零价铁(ZVI)和小毛石颗粒混合物组成的多层可渗透反应屏障(PRB)的效率。后者是一种火山材料，用于分散ZVI颗粒。ZVI的高分散性提高了长期的水力导电性，但由于ZVI的含量较低，会显著降低反应性。在本研究中，通过长期柱试验，研究了两种不同组合的两层结构的性能。第一层为“预处理层”，厚度为4 cm，体积比(ZVI/lapillus)为10:90或05:95，第二层体积比(ZVI/lapillus)为20:80。使用仅由20:80 ZVI/lapillus组成的单层配置作为基准。这三项试验是在铜、镍和锌的多重污染溶液中进行的。测试结果表明，在单层结构中，水力导电性会早期丧失，而在存在预处理层的情况下，PRB的寿命增加了68%。含有10% ZVI的预处理区延迟了堵塞现象，而含有5% ZVI的预处理区确保了正确的长期水力行为，并且在23厘米厚度下，镍的去除率高于77.6%，铜和锌的去除率高于99%，至少持续两个月。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.